Server IP address could not be found. DNS_PROBE_FINISHED_NXDOMAIN

I recently removed by website from Cloudafre and changed by name server to the one that is provided by my  web hosting company but  one of my website started showing : Server IP address could not be found. DNS_PROBE_FINISHED_NXDOMAIN. Any Suggestions how to fix let me know

website link: bhutanroyalteer.com